The hydraulic fan (below picture) used on 2002 Jeep WG Grand Cherokee 4.7L replaces both the electric fan and the engine driven mechanical fan. The hydraulic cooling fan is integral to the fan shroud and is located between the radiator and the engine. The power steering pump supplies the hydraulic fluid and pressure to rotate the cooling fan blade, while the electrical part of the fan is controlled by the JTEC.

The hydraulic fan drive (motor) consists of the three major following components: Steering flow control valve, Fan control valve, and Two stage G-rotor hydraulic drive. The hydraulic fan and drive is not serviceable. Therefore any failure of the fan blade, hydraulic fan drive or fan shroud requires replacement of the fan module because the fan blade and hydraulic fan drive are matched and balanced as a system and servicing either separately would disrupt this balance.

I have a 2004 Jeep Grand Cherokee Special Edition 4.7L V8. My hydraulic fan only revs full speed when it past half way on the temperature gauge and gets 3/4 way to max hot. The coolant is boiling at that point and comes out of the overflow. Can I remove the hydraulic fan solenoid and by pass it by putting a plug in place of it so that the full flow of power steering fluid will in turn make the fan run at max speed? If not can I just install a universal electric radiator and reroute the power steering lines that go to the hydraulic fan by plugging the hose that comes out of the bottom of the reservoir then route the hose from the pump to the hose going to the steering box by cutting and splicing the hoses together with hose clamps? Any help would be very much appreciated. Thank you.

Looking for wirring diagram on a jeep grand cherokee limited 2002 ..prevouis owner converted to electric fan and i wants to convert back to hydraulic fan but the wirring harnes for fan solinoid is cut out of harness dont know where to connect up again so PCM can tel when to go in second speed

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